Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) What:		/sys/class/backlight/<backlight>/bl_power
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) Date:		April 2005
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) KernelVersion:	2.6.12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) Contact:	Richard Purdie <rpurdie@rpsys.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 		Control BACKLIGHT power, values are FB_BLANK_* from fb.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 		 - FB_BLANK_UNBLANK (0)   : power on.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 		 - FB_BLANK_POWERDOWN (4) : power off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) Users:		HAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) What:		/sys/class/backlight/<backlight>/brightness
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) Date:		April 2005
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) KernelVersion:	2.6.12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) Contact:	Richard Purdie <rpurdie@rpsys.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		Control the brightness for this <backlight>. Values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		are between 0 and max_brightness. This file will also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 		show the brightness level stored in the driver, which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		may not be the actual brightness (see actual_brightness).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) Users:		HAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) What:		/sys/class/backlight/<backlight>/actual_brightness
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) Date:		March 2006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) KernelVersion:	2.6.17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) Contact:	Richard Purdie <rpurdie@rpsys.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		Show the actual brightness by querying the hardware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) Users:		HAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) What:		/sys/class/backlight/<backlight>/max_brightness
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) Date:		April 2005
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) KernelVersion:	2.6.12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) Contact:	Richard Purdie <rpurdie@rpsys.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		Maximum brightness for <backlight>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) Users:		HAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) What:		/sys/class/backlight/<backlight>/type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) KernelVersion:	2.6.37
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) Contact:	Matthew Garrett <mjg@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		The type of interface controlled by <backlight>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		"firmware": The driver uses a standard firmware interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		"platform": The driver uses a platform-specific interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		"raw": The driver controls hardware registers directly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		In the general case, when multiple backlight
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		interfaces are available for a single device, firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		control should be preferred to platform control should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		be preferred to raw control. Using a firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		interface reduces the probability of confusion with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		the hardware and the OS independently updating the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		backlight state. Platform interfaces are mostly a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		holdover from pre-standardisation of firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		interfaces.